CN1887768A - Porous fiber modified concrete - Google Patents
Porous fiber modified concrete Download PDFInfo
- Publication number
- CN1887768A CN1887768A CNA2005100354276A CN200510035427A CN1887768A CN 1887768 A CN1887768 A CN 1887768A CN A2005100354276 A CNA2005100354276 A CN A2005100354276A CN 200510035427 A CN200510035427 A CN 200510035427A CN 1887768 A CN1887768 A CN 1887768A
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- CN
- China
- Prior art keywords
- concrete
- fiber
- multiporous
- porous fiber
- performance
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0048—Fibrous materials
- C04B20/0056—Hollow or porous fibres
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to one kind of porous fiber modified cement-base concrete. Porous fiber material in certain amount is added into concrete or mortar via intensive mixing to form the concrete containing porous fiber. The concrete containing porous fiber as ideal building material has excellent fireproof and antiexplosion performance, anticracking performance, antiseepage performance, antifreezing performance, impact resistance and antiwear performance.
Description
Technical field
The present invention relates to a kind of concrete material, especially a kind of concrete of porous fiber modified cement-based material or mortar.
Background technology
Current society, fire failure often takes place.Occur in the interior fire failure of concrete structure (as tunnel, house, vault etc.) for those, most loss of life and personal injury are exploded owing to concrete or avalanche causes.And the major cause that causes concrete blast or avalanche often: when fire takes place, concrete temperature reaches about 1200 ℃ at short notice, moisture instantaneous expansion in the concrete is a large amount of water vapour, when the swelling pressure of water vapour generation surpassed the cohesive force of inside concrete, concrete will be blasted or avalanche.For this reason, concrete is not blasted or avalanche in the time of taking measures to guarantee the fire generation.
One of measure commonly used at present is at concrete surface brushing one deck frie retardant coating.This method can only be improved the flameproof effect of concrete surface layer, can not fundamentally improve the concrete capability of antidetonance, and can roll up quantities.
Another one measure commonly used at present is to add filamentary material in concrete.At present, filamentary material commonly used has steel fiber (as steel fiber and Stainless Steel Fibre), inorganic fibre (mainly containing man-made mineral fibers such as natural mineral fiber such as asbestos and alkali resistant glass fiber, alkali resistant mineral wool, carbon fiber) and entity organic fibre (mainly containing natural plant fibres such as synthon such as polypropylene, nylon, polyethylene, aromatic polyimide and sisal hemp) in the concrete.Wherein steel fiber and inorganic fibre can only improve concrete internal bond strength, to not effect of fire prevention antiknock.Though organic fibre can improve the concrete fire prevention capability of antidetonance to a certain extent, because it is solid, therefore this effect and not obvious.
Summary of the invention
The technical problem to be solved in the present invention is: can prevent or weaken that concrete is blasted or avalanche when presence of fire in concrete structures such as tunnel, eliminate simultaneously that the conventional concrete material fragility is easy to crack greatly, the shortcoming of bad mechanical property such as shock resistance, tension and toughness.
In order to solve the problems of the technologies described above, the invention provides a kind of multiporous fiber concrete or mortar that is used for cement-based material, it is made up of multiporous fiber and concrete.Multiporous fiber is a kind of organic reinforced fiber, and its raw material can be polypropylene, polyacrylonitrile, polyester, polymeric amide, polyethylene, polyvinyl alcohol, carbon fiber, aramid fiber.Multiporous fiber is ductile, good hydrophilic property, acid-alkali-corrosive-resisting, weathering resistance, characteristics such as fast light.Its concrete technical parameter sees Table 1.
The required concrete of this material can adopt normal concrete or mortar, latex concrete or mortar, various concrete or the mortar (as self-constriction concrete, high frost resistance concrete) that is mixed with chemical admixture, and the concrete or the mortar that are mixed with materials such as silica flour, flyash, steel fiber.
Table 1 multiporous fiber technical parameter
| The fibre section | The circle or the special crosssection in band 2-17 hole |
| Fibre diameter | 22m～56m |
| Intensity (N/mm 2) | ＞250 |
| Limit elongation (%) | 10～30％ |
| Length (mm) | 6～25 |
| Number of fiber (1,000,000/kg) | 76～200 |
| Density (g/cm 3) | ＞0.50 |
| Dispersed | Good |
According to the needs of actual engineering, the volume scope of multiporous fiber in concrete is controlled at 0.5kg～2kg/m
3Between.Along with the increase of fiber addition, performances such as concrete explosion-proof performance, anti crack performance, barrier properties, freeze-proof, shock resistance, resistance to abrasion are improved gradually.
Produce the multiporous fiber concrete and add multiporous fiber exactly in concrete material, fully stirring gets final product then.
Use multiporous fiber concrete construction of the present invention, can reach following beneficial effect:
1, improves the concrete fire prevention capability of antidetonance
At present, the coagulate layer thickness in the tunnel is generally 0.3～0.5 meter.Usually this concrete layer will be blasted or avalanche in 30 minutes after fire takes place.If adopt the concrete constructions engineering of having added multiporous fiber, after fire took place, multiporous fiber was softening when temperature reaches 170 ℃, liquefaction when reaching 200 ℃.After the multiporous fiber liquefaction, will stay a large amount of ducts in the concrete, these ducts can discharge in the concrete because the pressure that the water vapour expansion produces, and have so just reduced that concrete is blasted or the possibility of avalanche.The starting material polymkeric substance of multiporous fiber will decompose when temperature reaches 250 ℃, like this, will vacate more volume at inside concrete, and this has further alleviated the water vapour pressure of inside concrete, reduces that concrete is blasted or the possibility of avalanche.
2, improve concrete anti crack performance
After mixing multiporous fiber in the concrete, form three-dimensional staggered supporting network at inside concrete.Because the Young's modulus of multiporous fiber is higher than existing plastic cement base material, and diameter is thin, and fiber spacing is little, so helps to suppress the distortion of concrete early-age plastic shrinkage after mixing concrete, reduce the possibility that micro-cracks produces and expands, thereby improved concrete anti crack performance.
In addition, add multiporous fiber in concrete or the mortar, both reduced concrete contractility, improved concrete cohesiveness again, thereby effectively stoped the migration of concrete segregation and internal moisture, reduced owing to the cement slurry plastic shrinkage produces the rimose possibility.Along with the increase of fibers content, the energy of contraction is dispersed to has high-tensile and on the lower fiber of Young's modulus, concrete toughness strengthens, and the concrete micro-cracks is suppressed, and cracking reduces thereupon.
3, improve concrete barrier properties, resistance to frost
The multiporous fiber that is uniformly distributed in the concrete has played " support " effect, has reduced the bleed of concrete surface and the segregation that gathers materials, and micro content reduces greatly in the concrete thereby make;
Mixing of multiporous fiber reduced the initial native crack in the concrete, produced tangible resistance and split effect, and the impervious ability of fibrous concrete is improved greatly;
Multiporous fiber in the concrete can also be alleviated the inside concrete stress that produces owing to temperature variation, stops progress of fracture;
Mix in the process of multiporous fiber and introduced air, concrete frost resistance can be improved for inside concrete.
4, improve concrete shock resistance
The significant multiporous fiber of wetting ability can with the concrete material thorough mixing, form a kind of uniform three-dimensional disorderly to the network system that distributes at inside concrete.When concrete was hit loading action, this network system can relax the stress concentration at internal fissure tip, helped to absorb owing to the kinetic energy that shock load produced, and then effectively hindered fissured generation.
5, improve concrete abrasion resistance
At a high speed and the current that contain silt be serious to the destruction of buildings.This destruction is owing to impact, friction and the shear action of current to buildings.Because multiporous fiber has reduced concrete fragility, strengthen concrete impact resistance, improved concrete toughness, thereby improved the ability of anti-high speed burning into sand water impact, and fiber can bear jointly with cement and dash the mill load, delays the breakage of body.Fiber makes inside concrete overlap mutually, involve, and globality is strong, has hindered because impact and wearing and tearing cause fissured generation.In addition, fiber has also pind down peeling off of cement block, has improved concrete anti-impact mill ability.
Multiporous fiber concrete of the present invention is of many uses, comprising:
1. all kinds of traffic tunnels;
2. concrete member: cement pipe, electric pole, pile crown, concrete prefabricated board;
3. light cement member: wall decorating veneer, insulcrete, foamed concrete;
4. concrete placement: foundation works (structural waterproofing work :) as basement side wall, base plate etc.; Concrete road surface (highway, street etc.); Concrete thin plates (parking lot, court etc.); The basis of mechanical means; Seismic region buildings and other antidetonation purposes building; Exterior wall mortar plastering and other temperature difference compensation cracking resistance purposes; Safe barricade, impact baffle plate, pond, water-proof roofing, canal for water conveyance, dam, harbour;
5. finish coat: metal sheet concrete (cement) finish coat (as bridge floor etc.); The super thin capping layer of other concrete (cement);
6. spray, pump concrete: slope reinforcing, pipeline rehabilitation, Irrigation Ditch.
Embodiment
Describe embodiments of the present invention in detail below in conjunction with two examples:
Embodiment one: the contrast experiment who improves the concrete fire prevention capability of antidetonance
In order to verify the concrete fire-proof and explosion-proof effect of multiporous fiber, respectively normal concrete and multiporous fiber concrete have been carried out the contrast experiment, situation is as follows:
Test specimen 1: normal concrete test specimen
1) concrete grade C25.
2) concrete mix does not have other admixture with reference to " design of common concrete proportioning rules, JGJ55-2000 ".
3) after 28 day preserving period, tested.
4) stirring system: fine aggregate+cement+fiber+coarse aggregate dry mixing 1 minute added behind the water wet-mixing 2 minutes.
Test specimen 2: multiporous fiber concrete sample
1) mix proportion is the same;
2) adding volume in concrete is the polypropylene multiporous fiber of 2kg/m3.
3) stirring system: the mix method is the same, and the proper extension churning time makes fiber dispersion even.
Experimentation: with two groups of test specimens under 1200 ℃ condition heat-resisting 120 minutes, the destruction situation of two test specimens of observation.
Experiment effect: do not add the concrete (test specimen 1) of multiporous fiber, meet the fire back at 120 minutes implosives; The concrete (test specimen 2) that adds multiporous fiber does not have explosion behind the chance fire.
Embodiment two: the contrast experiment of anti-shrinkage performance
In order to verify the concrete anti-crack and anti-seepage effect of multiporous fiber, respectively normal concrete and multiporous fiber concrete have been carried out the contrast experiment, situation is as follows:
Test specimen 1: normal concrete test specimen
4) concrete grade C25.
5) concrete mix does not have other admixture with reference to " design of common concrete proportioning rules, JGJ55-2000 ".
6) stirring system: fine aggregate+cement+fiber+coarse aggregate dry mixing 1 minute added behind the water wet-mixing 2 minutes.
Test specimen 2: multiporous fiber concrete sample
1) mix proportion and mix the system technology the same.
2) adding volume in concrete is 2kg/m
3The polypropylene multiporous fiber.
3) stirring system: the proper extension churning time makes fiber dispersion even.
Experimentation carries out with reference to " the dry shrinkage crack testing method of mortar and concrete " mentioned among the U.S. ACI 544.2R-1989 " Measurement of Properties of Fiber Reinforced Concrete " (ACI-544 " fiber reinforced concrete performance test report ").
Experimental tool is the wooden model of a 914mm * 610mm * 19mm, and the template bottom is lined with polyethylene film, to reduce the influence of bed die to the test specimen shrinkage strain.Nail has a circle wire netting on the wall in the wooden model, is used to limit shrinkage strain.This wire netting is that the wire netting of 2mm is made for 90 ° along the center line bending with wide 25mm, mesh.
After concrete mixing is good, be cast in the wooden model, with doctor blade test specimen surface, open electric fan and tungsten-iodine lamp, electric fan is positioned at about 150mm place, wooden model limit, and wind speed is about 4.5m/s～5.5m/s, blows continuously 24 hours; The tungsten-iodine lamp that three power is 1000W is positioned at about 1.5m place, wooden model top, illumination 4 hours.
The fracture width that finishes the back test specimen according to experiment is divided into four grades to test specimen, weights of each grade correspondence.Fracture length with each grade test specimen multiply by its corresponding weights respectively, and the summation that obtains of adding up mutually again is called the cracking index, weighs cracking degree in view of the above.
Experimental result is: the cracking index of test specimen 1 is 1029, and the cracking index of test specimen 2 is 30.This explanation adds multiporous fiber and can significantly improve concrete resistance to cleavage in concrete.
Claims (2)
1. porous fiber modified concrete mainly is made up of normal concrete or mortar or latex concrete or mortar, can also contain chemical admixture or silica flour or flyash or steel fiber, and it is characterized in that: it also contains multiporous fiber.
2. a kind of multiporous fiber concrete according to claim 1 is characterized in that: the raw material of multiporous fiber can be polypropylene, polyacrylonitrile, polyester, polymeric amide, polyethylene, polyvinyl alcohol, carbon fiber, aramid fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100354276A CN1887768A (en) | 2005-06-27 | 2005-06-27 | Porous fiber modified concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100354276A CN1887768A (en) | 2005-06-27 | 2005-06-27 | Porous fiber modified concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1887768A true CN1887768A (en) | 2007-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100354276A Pending CN1887768A (en) | 2005-06-27 | 2005-06-27 | Porous fiber modified concrete |
Country Status (1)
| Country | Link |
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| CN (1) | CN1887768A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075747A1 (en) * | 2010-12-10 | 2012-06-14 | 东南大学 | Paraffin phase change energy storage materials and preparation method thereof |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
-
2005
- 2005-06-27 CN CNA2005100354276A patent/CN1887768A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075747A1 (en) * | 2010-12-10 | 2012-06-14 | 东南大学 | Paraffin phase change energy storage materials and preparation method thereof |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shanghai KNP Chemical Co., Ltd. Assignor: Haichuan Industry Co., Ltd., Shenzhen Contract fulfillment period: 2008.11.1 to 2020.11.1 contract change Contract record no.: 2008440000397 Denomination of invention: Porous fiber modified concrete License type: General permission Record date: 20081124 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: COMMON LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.11.1 TO 2020.11.1; CHANGE OF CONTRACT Name of requester: SHANGHAI QIPENG CHEMICAL CO., LTD. Effective date: 20081124 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |